<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="jquery-1.7.2.js"></script>
</head>
<body>
<style>
    #left {
        width: 80px;
        height: 600px;
        display: block;
        float: left;
    }
</style>
<iframe id="left" src="effect_login.html" frameborder="0"></iframe>
<script>
    $(function(){
        $("iframe").click(function(){
            console.log(123);
            $("#left").css('width','200px');
        })
    });
</script>
</body>
</html>